Add unit test and fix some more use cases

test/bin/tools/trimIndet.spec.ts

@@ -0,0 +1,57 @@
+import trimIndent from "keycloakify/bin/tools/trimIndent";
+import { it, describe, assert } from "vitest";
+
+describe("trimIndent", () => {
+
+    it("does not change a left-aligned string as expected", () => {
+        const txt = trimIndent`lorem
+ipsum`
+        assert.equal(txt, ['lorem', 'ipsum'].join('\n'))
+    })
+
+    it("removes leading and trailing empty lines from a left-aligned string", () => {
+        const txt = trimIndent`
+lorem
+ipsum
+`
+        assert.equal(txt, ['lorem', 'ipsum'].join('\n'))
+    })
+
+    it("removes indent from an aligned string", () => {
+        const txt = trimIndent`
+            lorem
+            ipsum
+        `
+        assert.equal(txt, ['lorem', 'ipsum'].join('\n'))
+    })
+
+    it("removes indent from unaligned string", () => {
+        const txt = trimIndent`
+            lorem
+                ipsum
+        `
+        assert.equal(txt, ['lorem', '    ipsum'].join('\n'))
+    })
+
+    it("removes only first and last empty line", () => {
+        const txt = trimIndent`
+
+            lorem
+            ipsum
+
+            `
+
+        assert.equal(txt, ['', 'lorem', 'ipsum', ''].join('\n'))
+    })
+
+
+    it("interpolates non-strings", () => {
+        const d = new Date()
+        const txt = trimIndent`
+            lorem
+            ${d}
+            ipsum`
+
+        assert.equal(txt, ['lorem', String(d), 'ipsum'].join('\n'))
+    })
+})